For every stable nucleus except hydrogen, if the number of nucleons is doubled, the quantity that will change least is the:
a. density.
c. charge.
b. mass.
d. volume.
A
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If an x-ray beam of wavelength 1.4 × 10-10 m makes an angle of 30° with a set of planes in a crystal causing first order constructive interference, what is the plane spacing?
A) 0.28 nm B) 0.070 nm C) 0.32 nm D) 0.16 nm E) 0.14 nm
A temperature difference of 9.0 Celsius degrees is equal to a Fahrenheit temperature difference of
a. 5.0 Fahrenheit degrees. b. 9.0 Fahrenheit degrees. c. 16 Fahrenheit degrees. d. 37 Fahrenheit degrees. e. 41 Fahrenheit degrees.
The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0°C. At 227°C the root-mean-square speed (thermal speed) of the molecules will be closest to
A) 260 m/s B) 630 m/s C) 330 m/s D) 160 m/s E) 2000 m/s
The magnetic field in a cyclotron is 0.50 T. Find the magnitude of the magnetic force on a proton with velocity of 
m/s in a plane perpendicular to the field.
A. 
B. 
C. 
D. 